Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Skeletonize 
Instant · Uncommon · Shards of Alara · #114
Skeletonize deals 3 damage to target creature. When a creature dealt damage this way dies this turn, create a 1/1 black Skeleton creature token with "{B}: Regenerate this token."
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 149 | Common | $0.35 | $0.49 |
| Shards of Alara | 114 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 16 March 2018You get the token created by Skeletonize's delayed triggered ability regardless of who controlled the creature.